System of electrical distribution.



No. 819,770. PATENTBD MAY 8, 1906.

B. G. LAMME.

SYSTEM OF ELECTRICAL DISTRIBUTION.

APPLICATION FILED JUNE 30, 1904.

WITNESSES: I INVENTOR shunt or separately-excited field mag rrno srArEs PATENT OFFICE.

WESTINGHOUSE ELECTRIC & PORATION OF PENNSYLVANIA.

MANUFACTURING COMPANY, A COR- SYSTEWE OF ELECTRICAL DISTRIBUTION:

To all whom it may concern Be it knownthat I, BENJAMIN G. LAMME, a citizen of the United States, and a resident of Pittsbur in the county ofAllegheny and State of ennsylvania, have invented a new and usefullmprovement in Systems of Electrical Distribution, of which the following is a specification. My invention relates to systems of electrical distribution which embody generators or rotary converters that are provided with net windings; and it has for its object to provide means whereby such machines ma serve the purpose of com ound-wou nd mac 'nes without roviding t em with series field-magnet win ings.

It sometimes happens that an electrical machine is desired for'temporary use in such relations as demanda compound field-magnet winding or its equivalent and for a subsequent use as a shunt or separately-excited machine or for alternate use in the tworelations. Under such conditions it will not be found desirable or feasible to provide the 'machines with'series' windings, particularly in case the space available for field-magnet windings is substantially occupied by shunt or separately-excited coils.

In orderto meet, the conditions of service above mentioned} propose to' employ a combination of a shunt or separately-excited rotary converter or generator with certain -auX- iliar -machines, substantially. as illustrated in the Figures '1, 2, and 3 are diagrammatic views of three different forms of such general combination. 1

As illustrated in Fig. 1, the field-magnet winding 1 of a'rotary converter 2 is connected across .the terminals of. its armature 3 through its commutator 4, more or less of a variable resistance 5 being connected in series with such winding. The armature 6 of a small direct-current machine 7 is included in the field-magnet circuit and is driven by a motor 8, the armature 9 of which is connected across the main direct-current circuit 10 11 and. the field-magnet winding 12 of which is connected in shunt to the armature. The small direct-current machine 7 me have its field-magnet winding 13 connected in series relation with the main circuit 10 11, so that it Specification of Letters Patent.

Application filed June 30. 1904. Serial No. 214,823.

accompanying drawings, in which.

Patented May s, 1906.

will generate no voltage when there is no .cur-' rent on the line. When the line is provided with a load, however, the field-magnet of the small direct-current machinef will be excited and a voltage will be generated which will be proportional to the current in the line. This voltage will be added to that of the excitingcurrent of the main machine 2 in which a compounding eflect is desired. and therefore the current in its field-magnet circuit will be in- It follows,

same com-.-v that would ed by a series field-magnet windingj be made, and particuing 14, which acts in opposition to the shunt- Winding 12 and is connected in series relation with the main direct-current circuit 10 .11, so that 'an increase of speed will be obtained as the load upon the main generator increases. If the driving-motor 8 of the compounding outfit is worked at high induction or above the bend in the saturation-curve for a condition of no load, it will increase in speed gradually as the main-circuit load isincreased, and with heavier loads the speed will increase at a greater ratio as the magnetization passes be ow the bend in the saturation-curve. Inthis way the gradual speed increase of the small motor Will give a greater voltage in crease in the small generator, and thereby a greater degree of compounding for the main machine under heavier loads. therefore, that the ordinary droop or bend in the regulation curve machine ma son of the act that the compounding at heavier loads is greater in proportion than that at lighter loads.

In Fig. 3 I have shown a modification of,

my invention in which the small direct-current machine 7 is driven by an alternatingc'urrent motor 15 that receives its propelling energy from the alternating-curren' mains 16 that supply the rotary converter 2. 1",

As already indicated, my invention is adapted for use in connection with either generators or rotary converters, and any It follows,

structural features or circuit connections which it may be found desirable to employ I desire to be regarded within the scope oil my invention, so long as the mode/oi operation and result remain substantially the some.

I claim as my invention- 1. The combination with a (lynainomlectric machine having a shunt 'l'ielthmagnet Winding, of an auxiliary machine having its armature in the field-magnet circuit of the main machine and its field-magnet winding in series relation to the main clistrihutingwin cuit, and a motor for machine having its #SLIIHitliLIIG connected across the main distributing-circuit and llfl-V- ing a shunt field-magnet winding and. an opposing series winding, the magnetic circuit of i the motor being satureteol under no-loeri conditionsi 2. The combination with a main dynamoclcctric machine having a shunt field-magnet winding, of :in mixiiierv machine having its to the field-megarmcturc in series .Jele

Lion net Winding of no main machine unrl its fieldmugnet Winding 'n series relation to the main (listributing-circuit and a shunt motor for driving saidv auxiliary machine that is con nee-ted across the main distributing-circuit and has a iielil-nmgnet Winding that is connected in series rel tion to the main circuit and opposes the shunt Winding. driving said auxiliary In testin'iony whereof 1 here hereunto subscribed my name this 28th day of June, 190s.

BENJ. G. LAMME.

\Witi'iesses:

E. M. STEWARTI, BIRNEY Eli-mas. 

